Silicon-oxygen composite negative electrode material, preparation method thereof and lithium ion battery

A negative electrode material, silicon-oxygen technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex coating process, no breakthrough in performance improvement, and high coating cost.

Active Publication Date: 2021-07-02
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Titanium dioxide is also one of the common coating materials. The first effect and capacity have been improved to a certain extent. However, the high coating cost and complicated coating process limit its use, and at the same time, no breakthrough has been made in performance improvement.

Method used

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  • Silicon-oxygen composite negative electrode material, preparation method thereof and lithium ion battery
  • Silicon-oxygen composite negative electrode material, preparation method thereof and lithium ion battery
  • Silicon-oxygen composite negative electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0077] Second aspect, such as figure 1 As shown, the application provides a method for preparing a silicon-oxygen composite negative electrode material, comprising the following steps:

[0078] S100, mixing the precursor with the pre-lithiated carbon-coated silicon-oxygen material, and performing a solid-state thermal reaction under a protective atmosphere to obtain a silicon-oxygen composite negative electrode material; the precursor includes a mixture of a phosphate ion-containing compound and a metal compound , metal phosphate, at least one of a mixture of a silicate ion compound and a metal compound, and a metal silicate; the silicon-oxygen composite negative electrode material includes a silicon-oxygen material and a composite coating layer formed on the surface of the silicon-oxygen material, The composite coating layer includes a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. ...

Embodiment 1

[0128] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;

[0129] (2) Put V 2 o 5 Mix with phosphoric acid in a molar ratio of 1:3 to obtain a precursor;

[0130] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, roast at 900°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.

[0131] The average particle size (D 50 ) is 5.13μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.19m 2 / g, the porosity is 1.98%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, and the lithium-containing compound is mainly Li 3 V 2 (PO 4 ) 3 , the lithium-containing compound is dispersed and filled in the pores of the...

Embodiment 2

[0133] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;

[0134] (2) MgO and SiO 2 Mix according to the molar ratio of 1:1 to obtain the precursor;

[0135] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, bake at 700°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.

[0136] The average particle diameter (D 50 ) is 5.12μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.17m 2 / g, the porosity is 1.99%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, wherein the lithium-containing compound includes Li 2 MgSiO 4 , the lithium-containing compound is dispersed and filled in the pores of the carbon ...

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Abstract

The invention relates to a silicon-oxygen composite negative electrode material, a preparation method thereof and a lithium ion battery, the silicon-oxygen composite negative electrode material comprises a silicon-oxygen material and a composite coating layer coating the surface of the silicon-oxygen material, the composite coating layer comprises a carbon material and a lithium-containing compound, the carbon material has pores, and the pores are filled with the lithium-containing compound. The silicon-oxygen composite negative electrode material and the preparation method thereof are simple and low in cost, industrial production is easy to realize, the prepared silicon-oxygen composite negative electrode material has excellent electrochemical cycle and expansion inhibition performance, and the service life of a lithium ion battery can be prolonged.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, and relates to a silicon-oxygen composite negative electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Silicon oxide material is an essential anode material in a new generation of ultra-large capacity lithium-ion batteries. The silicon oxide industry has been researching and laying out the development of silicon-based lithium-ion batteries for more than ten years. However, silicon-based materials represented by silicon oxide have not been used on a large scale. The main factor limiting the application of silicon oxide materials is caused by the natural disadvantages of silicon-based materials. High expansion and drastic volume change, low first effect, etc. are all problems that need to be solved urgently. [0003] Interfacial reaction regulation is one of the important directions to suppress the expansion of the pole piece an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10H01M4/36H01M4/5825H01M4/485H01M4/364H01M4/48H01M10/052H01M4/1395H01M4/38H01M4/131H01M2004/027H01M2004/021H01M4/382H01M4/587H01M4/386H01M4/134
Inventor 谢维庞春雷邓志强任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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